UniProtKB/Swiss-Prot P11509: Variant p.Leu160His

• Variant information
• Sequence information
• Literature citations
• All

Variant information

Variant position: 160 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Type of variant: LB/B The variants are classified into three categories: LP/P, LB/B and US.

• LP/P: likely pathogenic or pathogenic.
• LB/B: likely benign or benign.
• US: uncertain significance

Residue change: From Leucine (L) to Histidine (H) at position 160 (L160H, p.Leu160His). Indicates the amino acid change of the variant. The one-letter and three-letter codes for amino acids used in UniProtKB/Swiss-Prot are those adopted by the commission on Biochemical Nomenclature of the IUPAC-IUB.
Physico-chemical properties: Change from medium size and hydrophobic (L) to medium size and polar (H) The physico-chemical property of the reference and variant residues and the change implicated.
BLOSUM score: -3 The score within a Blosum matrix for the corresponding wild-type to variant amino acid change. The log-odds score measures the logarithm for the ratio of the likelihood of two amino acids appearing by chance. The Blosum62 substitution matrix is used. This substitution matrix contains scores for all possible exchanges of one amino acid with another:

• Lowest score: -4 (low probability of substitution).
• Highest score: 11 (high probability of substitution).

More information can be found on the following page
Variant description: In allele CYP2A6*2; unable to catalyze 7-hydroxylation of coumarin; causes switching from coumarin 7-hydroxylation to 3-hydroxylation. Any additional useful information about the variant.
Other resources: Links to websites of interest for the variant.

• Variant rs1801272 [ dbSNP | Ensembl ]

Sequence information

Variant position: 160 The position of the amino-acid change on the UniProtKB canonical protein sequence.
Protein sequence length: 494 The length of the canonical sequence.
Location on the sequence: VGKRGIEERIQEEAGFLIDA L RGTGGANIDPTFFLSRTVSN The residue change on the sequence. Unless the variant is located at the beginning or at the end of the protein sequence, both residues upstream (20) and downstream (20) of the variant will be shown.
Sequence annotation in neighborhood: The regions or sites of interest surrounding the variant. In general the features listed are posttranslational modifications, binding sites, enzyme active sites, local secondary structure or other characteristics reported in the cited references. The "Sequence annotation in neighborhood" lines have a fixed format:

• Type: the type of sequence feature.
• Positions: endpoints of the sequence feature.
• Description: contains additional information about the feature.

Type	Positions	Description
Chain	1 – 494	Cytochrome P450 2A6
Helix	143 – 162

Literature citations

cDNA and deduced amino acid sequences of human P450 IIA3 (CYP2A3).
Yamano S.; Nagata K.; Yamazoe Y.; Kato R.; Gelboin H.V.; Gonzalez F.J.;
Nucleic Acids Res. 17:4888-4888(1989)
Cited for: NUCLEOTIDE SEQUENCE [MRNA]; VARIANT HIS-160; The CYP2A3 gene product catalyzes coumarin 7-hydroxylation in human liver microsomes.
Yamano S.; Tatsuno J.; Gonzalez F.J.;
Biochemistry 29:1322-1329(1990)
Cited for: NUCLEOTIDE SEQUENCE [MRNA]; VARIANT HIS-160; CHARACTERIZATION OF VARIANT HIS-160; The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC).
The MGC Project Team;
Genome Res. 14:2121-2127(2004)
Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA]; VARIANTS HIS-160 AND ARG-476; A single amino acid substitution (Leu160His) in cytochrome P450 CYP2A6 causes switching from 7-hydroxylation to 3-hydroxylation of coumarin.
Hadidi H.; Zahlsen K.; Idle J.R.; Cholerton S.;
Food Chem. Toxicol. 35:903-907(1997)
Cited for: CHARACTERIZATION OF VARIANT HIS-160;